[ICOM] IC720A filter - II

[GGLL]

Well, thanks for the answers. Today I've wrote to Icom America amateur 
support and got this answer from a technical support representative:
******************************************************************
Hi there,

Sorry, we do not have specifications for the FL29 filter and do not know 
where you may find the requested specs.
*******************************************************************

I'll try to write to Icom Japan for filter specs. Also, as per one 
e-mail advice, I had no luck in Murata site.
By the way, digging into the individual "internal" filters, I found 
they're identified as:

  39M15A
  N.K.D.

I suppose the last is the manufacturer brand, my question is if anyone 
know which brand is this. I knew of NDK, but no N.K.D.


Many thanks in advance.
Best regards
Guillermo - LU8EYW.